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        </div><article class="page single"><h1 class="single-title animated flipInX">Spring源码 - BeanFactoryPostProcessor的注册与执行</h1><div class="post-meta">
            <div class="post-meta-line"><span class="post-author"><a href="https://wlizhi.cc" title="Author" target="_blank" rel="noopener noreffer author" class="author"><i class="fas fa-user-circle fa-fw"></i>Wlizhi</a></span>&nbsp;<span class="post-category">收录于 <a href="/categories/spring/"><i class="far fa-folder fa-fw"></i>spring</a></span></div>
            <div class="post-meta-line"><i class="far fa-calendar-alt fa-fw"></i>&nbsp;<time datetime="2020-11-24">2020-11-24</time>&nbsp;<i class="fas fa-pencil-alt fa-fw"></i>&nbsp;约 2797 字&nbsp;
                <i class="far fa-clock fa-fw"></i>&nbsp;预计阅读 6 分钟&nbsp;<span id="/posts/spring/03-bean-factory-post-processor-registry-and-execute/" class="leancloud_visitors" data-flag-title="Spring源码 - BeanFactoryPostProcessor的注册与执行">
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  <ul>
    <li><a href="#1-beanfactorypostprocessor">1 BeanFactoryPostProcessor</a></li>
    <li><a href="#2-beandefinitionregistrypostprocessor">2 BeanDefinitionRegistryPostProcessor</a></li>
    <li><a href="#3-调用逻辑">3 调用逻辑</a></li>
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            </div><div class="content" id="content"><p>spring源码系列文章，示例代码的中文注释，均是 copy 自 <a href="https://gitee.com/wlizhi/spring-framework" target="_blank" rel="noopener noreffer">https://gitee.com/wlizhi/spring-framework</a> 。</p>
<p>链接中源码是作者从 github 下载，并以自身理解对核心流程及主要节点做了详细的中文注释。</p>
<hr>
<h2 id="1-beanfactorypostprocessor">1 BeanFactoryPostProcessor</h2>
<p>BeanFactoryPostProcessor中只有一个方法postProcessBeanFactory，实现了这个接口的类，会优先于其他常规的类实例化，并调用postProcessBeanFactory方法。</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="nd">@FunctionalInterface</span>
</span></span><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">interface</span> <span class="nc">BeanFactoryPostProcessor</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="kt">void</span> <span class="nf">postProcessBeanFactory</span><span class="o">(</span><span class="n">ConfigurableListableBeanFactory</span> <span class="n">beanFactory</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">BeansException</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><h2 id="2-beandefinitionregistrypostprocessor">2 BeanDefinitionRegistryPostProcessor</h2>
<p>BeanDefinitionRegistryPostProcessor是BeanFactoryPostProcessor的子接口，同样的，它会优先与其他常规的类，提前实例化、加入到IOC容器，并会调用postProcessBeanDefinitionRegistry()方法，再调用postProcessBeanFactory()方法。</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">interface</span> <span class="nc">BeanDefinitionRegistryPostProcessor</span> <span class="kd">extends</span> <span class="n">BeanFactoryPostProcessor</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="kt">void</span> <span class="nf">postProcessBeanDefinitionRegistry</span><span class="o">(</span><span class="n">BeanDefinitionRegistry</span> <span class="n">registry</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">BeansException</span><span class="o">;</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><h2 id="3-调用逻辑">3 调用逻辑</h2>
<ol>
<li>首先搜集从BeanFactory中后去所有BeanDefinitionRegistryPostProcessor类型的beanName。</li>
<li>筛选出实现了PriorityOrdered接口的（<code>筛选过程中会调用getBean()方法</code>），并对其进行排序，然后进行遍历调用postProcessBeanDefinitionRegistry()。</li>
<li>筛选出实现了Ordered接口的，同上，进行getBean()，并排序，然后进行遍历调用postProcessBeanDefinitionRegistry()。</li>
<li>对没有实现PriorityOrdered接口且没有实现Ordered接口的BeanDefinitionRegistryPostProcessor进行排序、调用postProcessBeanDefinitionRegistry()。</li>
<li>上面的每一步调用postProcessBeanDefinitionRegistry()之前，会将其实力缓存到一个名为registryProcessors的List集合中，在以上步骤执行完，会调用BeanDefinitionRegistryPostProcessor.postProcessBeanFactory()方法</li>
<li>对没有实现BeanDefinitionRegistryPostProcessor但实现了BeanFactoryPostProcessor的类进行搜集。</li>
<li>分别筛选出实现了PriorityOrdered接口、Ordered接口、没有实现接口的类，对其进行排序、getBean()操作，调用postProcessBeanFactory()方法。</li>
</ol>
<p>从源码中，我们可以很清晰的看到执行流程。源码逻辑如下：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">final</span> <span class="kd">class</span> <span class="nc">PostProcessorRegistrationDelegate</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">invokeBeanFactoryPostProcessors</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">			<span class="n">ConfigurableListableBeanFactory</span> <span class="n">beanFactory</span><span class="o">,</span> <span class="n">List</span><span class="o">&lt;</span><span class="n">BeanFactoryPostProcessor</span><span class="o">&gt;</span> <span class="n">beanFactoryPostProcessors</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// 这里存储了已经调用过的BeanFactoryPostProcessor。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// BeanDefinitionRegistryPostProcessor是BeanFactoryPostProcessor的子接口。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// 先调用BeanDefinitionRegistryPostProcessor的方法，然后是BeanFactoryPostProcessor
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// Invoke BeanDefinitionRegistryPostProcessors first, if any.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">Set</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;</span> <span class="n">processedBeans</span> <span class="o">=</span> <span class="k">new</span> <span class="n">HashSet</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="n">beanFactory</span> <span class="k">instanceof</span> <span class="n">BeanDefinitionRegistry</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">BeanDefinitionRegistry</span> <span class="n">registry</span> <span class="o">=</span> <span class="o">(</span><span class="n">BeanDefinitionRegistry</span><span class="o">)</span> <span class="n">beanFactory</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 这里面装的是实现了BeanFactoryPostProcessor接口的。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">List</span><span class="o">&lt;</span><span class="n">BeanFactoryPostProcessor</span><span class="o">&gt;</span> <span class="n">regularPostProcessors</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 这里面装的是实现了BeanDefinitionRegistryPostProcessor接口的。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">List</span><span class="o">&lt;</span><span class="n">BeanDefinitionRegistryPostProcessor</span><span class="o">&gt;</span> <span class="n">registryProcessors</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">			<span class="c1">// 对参数中传入的beanFactoryPostProcessors优先执行BeanDefinitionRegistryPostProcessor的方法，然后添加到registryProcessors中。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="k">for</span> <span class="o">(</span><span class="n">BeanFactoryPostProcessor</span> <span class="n">postProcessor</span> <span class="o">:</span> <span class="n">beanFactoryPostProcessors</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="k">if</span> <span class="o">(</span><span class="n">postProcessor</span> <span class="k">instanceof</span> <span class="n">BeanDefinitionRegistryPostProcessor</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">					<span class="n">BeanDefinitionRegistryPostProcessor</span> <span class="n">registryProcessor</span> <span class="o">=</span>
</span></span><span class="line"><span class="cl">							<span class="o">(</span><span class="n">BeanDefinitionRegistryPostProcessor</span><span class="o">)</span> <span class="n">postProcessor</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">					<span class="n">registryProcessor</span><span class="o">.</span><span class="na">postProcessBeanDefinitionRegistry</span><span class="o">(</span><span class="n">registry</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">					<span class="n">registryProcessors</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">registryProcessor</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="o">}</span>
</span></span><span class="line"><span class="cl">				<span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">					<span class="n">regularPostProcessors</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">postProcessor</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">			<span class="c1">// 记录当前注册的BeanDefinitionRegistryPostProcessor
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">// Do not initialize FactoryBeans here: We need to leave all regular beans
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">// uninitialized to let the bean factory post-processors apply to them!
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">// Separate between BeanDefinitionRegistryPostProcessors that implement
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">// PriorityOrdered, Ordered, and the rest.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">List</span><span class="o">&lt;</span><span class="n">BeanDefinitionRegistryPostProcessor</span><span class="o">&gt;</span> <span class="n">currentRegistryProcessors</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">			<span class="c1">// 从beanFactory中的beanDefinitionNames中获取所有的beanName。将实现了PriorityOrdered接口部分，放到处理过的bean容器中。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">// First, invoke the BeanDefinitionRegistryPostProcessors that implement PriorityOrdered.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">String</span><span class="o">[]</span> <span class="n">postProcessorNames</span> <span class="o">=</span>
</span></span><span class="line"><span class="cl">					<span class="n">beanFactory</span><span class="o">.</span><span class="na">getBeanNamesForType</span><span class="o">(</span><span class="n">BeanDefinitionRegistryPostProcessor</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="kc">true</span><span class="o">,</span> <span class="kc">false</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="k">for</span> <span class="o">(</span><span class="n">String</span> <span class="n">ppName</span> <span class="o">:</span> <span class="n">postProcessorNames</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="k">if</span> <span class="o">(</span><span class="n">beanFactory</span><span class="o">.</span><span class="na">isTypeMatch</span><span class="o">(</span><span class="n">ppName</span><span class="o">,</span> <span class="n">PriorityOrdered</span><span class="o">.</span><span class="na">class</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">					<span class="c1">// 这里进行了getBean操作。类的实例化就是通过此方法进行。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>					<span class="n">currentRegistryProcessors</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">beanFactory</span><span class="o">.</span><span class="na">getBean</span><span class="o">(</span><span class="n">ppName</span><span class="o">,</span> <span class="n">BeanDefinitionRegistryPostProcessor</span><span class="o">.</span><span class="na">class</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">					<span class="n">processedBeans</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">ppName</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 对上面搜集到的BeanDefinitionRegistryPostProcessor进行排序、执行BeanDefinitionRegistryPostProcessor的方法
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">sortPostProcessors</span><span class="o">(</span><span class="n">currentRegistryProcessors</span><span class="o">,</span> <span class="n">beanFactory</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">registryProcessors</span><span class="o">.</span><span class="na">addAll</span><span class="o">(</span><span class="n">currentRegistryProcessors</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">invokeBeanDefinitionRegistryPostProcessors</span><span class="o">(</span><span class="n">currentRegistryProcessors</span><span class="o">,</span> <span class="n">registry</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">currentRegistryProcessors</span><span class="o">.</span><span class="na">clear</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">			<span class="c1">// 搜集实现了Ordered接口的BeanDefinitionRegistryPostProcessor，执行同上的逻辑。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">// Next, invoke the BeanDefinitionRegistryPostProcessors that implement Ordered.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">postProcessorNames</span> <span class="o">=</span> <span class="n">beanFactory</span><span class="o">.</span><span class="na">getBeanNamesForType</span><span class="o">(</span><span class="n">BeanDefinitionRegistryPostProcessor</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="kc">true</span><span class="o">,</span> <span class="kc">false</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="k">for</span> <span class="o">(</span><span class="n">String</span> <span class="n">ppName</span> <span class="o">:</span> <span class="n">postProcessorNames</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="k">if</span> <span class="o">(!</span><span class="n">processedBeans</span><span class="o">.</span><span class="na">contains</span><span class="o">(</span><span class="n">ppName</span><span class="o">)</span> <span class="o">&amp;&amp;</span> <span class="n">beanFactory</span><span class="o">.</span><span class="na">isTypeMatch</span><span class="o">(</span><span class="n">ppName</span><span class="o">,</span> <span class="n">Ordered</span><span class="o">.</span><span class="na">class</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">					<span class="n">currentRegistryProcessors</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">beanFactory</span><span class="o">.</span><span class="na">getBean</span><span class="o">(</span><span class="n">ppName</span><span class="o">,</span> <span class="n">BeanDefinitionRegistryPostProcessor</span><span class="o">.</span><span class="na">class</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">					<span class="n">processedBeans</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">ppName</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span><span class="c1">// 排序、执行postProcessBeanDefinitionRegistry()方法
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">sortPostProcessors</span><span class="o">(</span><span class="n">currentRegistryProcessors</span><span class="o">,</span> <span class="n">beanFactory</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">registryProcessors</span><span class="o">.</span><span class="na">addAll</span><span class="o">(</span><span class="n">currentRegistryProcessors</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">invokeBeanDefinitionRegistryPostProcessors</span><span class="o">(</span><span class="n">currentRegistryProcessors</span><span class="o">,</span> <span class="n">registry</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">currentRegistryProcessors</span><span class="o">.</span><span class="na">clear</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">			<span class="c1">// Finally, invoke all other BeanDefinitionRegistryPostProcessors until no further ones appear.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="kt">boolean</span> <span class="n">reiterate</span> <span class="o">=</span> <span class="kc">true</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">			<span class="k">while</span> <span class="o">(</span><span class="n">reiterate</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">reiterate</span> <span class="o">=</span> <span class="kc">false</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">				<span class="n">postProcessorNames</span> <span class="o">=</span> <span class="n">beanFactory</span><span class="o">.</span><span class="na">getBeanNamesForType</span><span class="o">(</span><span class="n">BeanDefinitionRegistryPostProcessor</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="kc">true</span><span class="o">,</span> <span class="kc">false</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="k">for</span> <span class="o">(</span><span class="n">String</span> <span class="n">ppName</span> <span class="o">:</span> <span class="n">postProcessorNames</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">					<span class="k">if</span> <span class="o">(!</span><span class="n">processedBeans</span><span class="o">.</span><span class="na">contains</span><span class="o">(</span><span class="n">ppName</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">						<span class="n">currentRegistryProcessors</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">beanFactory</span><span class="o">.</span><span class="na">getBean</span><span class="o">(</span><span class="n">ppName</span><span class="o">,</span> <span class="n">BeanDefinitionRegistryPostProcessor</span><span class="o">.</span><span class="na">class</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">						<span class="n">processedBeans</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">ppName</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">						<span class="n">reiterate</span> <span class="o">=</span> <span class="kc">true</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">					<span class="o">}</span>
</span></span><span class="line"><span class="cl">				<span class="o">}</span>
</span></span><span class="line"><span class="cl">				<span class="n">sortPostProcessors</span><span class="o">(</span><span class="n">currentRegistryProcessors</span><span class="o">,</span> <span class="n">beanFactory</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="n">registryProcessors</span><span class="o">.</span><span class="na">addAll</span><span class="o">(</span><span class="n">currentRegistryProcessors</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="n">invokeBeanDefinitionRegistryPostProcessors</span><span class="o">(</span><span class="n">currentRegistryProcessors</span><span class="o">,</span> <span class="n">registry</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="n">currentRegistryProcessors</span><span class="o">.</span><span class="na">clear</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 执行postProcessBeanFactory方法。先执行实现了BeanDefinitionRegistryPostProcessor接口的，
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">// 再执行实现了BeanFactoryPostProcessor的。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">// Now, invoke the postProcessBeanFactory callback of all processors handled so far.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">invokeBeanFactoryPostProcessors</span><span class="o">(</span><span class="n">registryProcessors</span><span class="o">,</span> <span class="n">beanFactory</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">invokeBeanFactoryPostProcessors</span><span class="o">(</span><span class="n">regularPostProcessors</span><span class="o">,</span> <span class="n">beanFactory</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 第一次进来会走到这里，因为参数beanFactoryPostProcessors是空的，实际上这里什么都没做。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">// Invoke factory processors registered with the context instance.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">invokeBeanFactoryPostProcessors</span><span class="o">(</span><span class="n">beanFactoryPostProcessors</span><span class="o">,</span> <span class="n">beanFactory</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// 从BeanFactory的BeanDefinitionNames中获取所有的BeanFactoryPostProcessor对应的名称
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// Do not initialize FactoryBeans here: We need to leave all regular beans
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// uninitialized to let the bean factory post-processors apply to them!
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">String</span><span class="o">[]</span> <span class="n">postProcessorNames</span> <span class="o">=</span>
</span></span><span class="line"><span class="cl">				<span class="n">beanFactory</span><span class="o">.</span><span class="na">getBeanNamesForType</span><span class="o">(</span><span class="n">BeanFactoryPostProcessor</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="kc">true</span><span class="o">,</span> <span class="kc">false</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// 对实现了PriorityOrdered、Ordered、和未实现接口的类分开处理。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// Separate between BeanFactoryPostProcessors that implement PriorityOrdered,
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// Ordered, and the rest.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">List</span><span class="o">&lt;</span><span class="n">BeanFactoryPostProcessor</span><span class="o">&gt;</span> <span class="n">priorityOrderedPostProcessors</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">		<span class="n">List</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;</span> <span class="n">orderedPostProcessorNames</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">		<span class="n">List</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;</span> <span class="n">nonOrderedPostProcessorNames</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">		<span class="k">for</span> <span class="o">(</span><span class="n">String</span> <span class="n">ppName</span> <span class="o">:</span> <span class="n">postProcessorNames</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">if</span> <span class="o">(</span><span class="n">processedBeans</span><span class="o">.</span><span class="na">contains</span><span class="o">(</span><span class="n">ppName</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// skip - already processed in first phase above
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="k">else</span> <span class="k">if</span> <span class="o">(</span><span class="n">beanFactory</span><span class="o">.</span><span class="na">isTypeMatch</span><span class="o">(</span><span class="n">ppName</span><span class="o">,</span> <span class="n">PriorityOrdered</span><span class="o">.</span><span class="na">class</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">priorityOrderedPostProcessors</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">beanFactory</span><span class="o">.</span><span class="na">getBean</span><span class="o">(</span><span class="n">ppName</span><span class="o">,</span> <span class="n">BeanFactoryPostProcessor</span><span class="o">.</span><span class="na">class</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="k">else</span> <span class="k">if</span> <span class="o">(</span><span class="n">beanFactory</span><span class="o">.</span><span class="na">isTypeMatch</span><span class="o">(</span><span class="n">ppName</span><span class="o">,</span> <span class="n">Ordered</span><span class="o">.</span><span class="na">class</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">orderedPostProcessorNames</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">ppName</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">nonOrderedPostProcessorNames</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">ppName</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// 首先执行实现了PriorityOrdered的BeanFactoryPostProcessors
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// First, invoke the BeanFactoryPostProcessors that implement PriorityOrdered.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">sortPostProcessors</span><span class="o">(</span><span class="n">priorityOrderedPostProcessors</span><span class="o">,</span> <span class="n">beanFactory</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">invokeBeanFactoryPostProcessors</span><span class="o">(</span><span class="n">priorityOrderedPostProcessors</span><span class="o">,</span> <span class="n">beanFactory</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// 执行实现了Ordered接口的BeanFactoryPostProcessors
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// Next, invoke the BeanFactoryPostProcessors that implement Ordered.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">List</span><span class="o">&lt;</span><span class="n">BeanFactoryPostProcessor</span><span class="o">&gt;</span> <span class="n">orderedPostProcessors</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">		<span class="k">for</span> <span class="o">(</span><span class="n">String</span> <span class="n">postProcessorName</span> <span class="o">:</span> <span class="n">orderedPostProcessorNames</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">orderedPostProcessors</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">beanFactory</span><span class="o">.</span><span class="na">getBean</span><span class="o">(</span><span class="n">postProcessorName</span><span class="o">,</span> <span class="n">BeanFactoryPostProcessor</span><span class="o">.</span><span class="na">class</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="n">sortPostProcessors</span><span class="o">(</span><span class="n">orderedPostProcessors</span><span class="o">,</span> <span class="n">beanFactory</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">invokeBeanFactoryPostProcessors</span><span class="o">(</span><span class="n">orderedPostProcessors</span><span class="o">,</span> <span class="n">beanFactory</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// 执行未实现接口的BeanFactoryPostProcessor
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// Finally, invoke all other BeanFactoryPostProcessors.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">List</span><span class="o">&lt;</span><span class="n">BeanFactoryPostProcessor</span><span class="o">&gt;</span> <span class="n">nonOrderedPostProcessors</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">		<span class="k">for</span> <span class="o">(</span><span class="n">String</span> <span class="n">postProcessorName</span> <span class="o">:</span> <span class="n">nonOrderedPostProcessorNames</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">nonOrderedPostProcessors</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">beanFactory</span><span class="o">.</span><span class="na">getBean</span><span class="o">(</span><span class="n">postProcessorName</span><span class="o">,</span> <span class="n">BeanFactoryPostProcessor</span><span class="o">.</span><span class="na">class</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="n">invokeBeanFactoryPostProcessors</span><span class="o">(</span><span class="n">nonOrderedPostProcessors</span><span class="o">,</span> <span class="n">beanFactory</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// Clear cached merged bean definitions since the post-processors might have
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// modified the original metadata, e.g. replacing placeholders in values...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">beanFactory</span><span class="o">.</span><span class="na">clearMetadataCache</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
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